ん？

http://d.hatena.ne.jp/odz/20071214/1197609733
anonymous functionの速度が速いのは気のせいかな？（環境はどちらも firefox 2.0）
環境Ａ

preparing ...
let's go!
.
*** simple (taint global scope) ***
result : 0.022632218[ms]
.
*** anonymous function ***
result : 0.023932217999999998[ms]
.
*** closure (function only) ***
result : 0.030432218[ms]
.
*** closure (function and regexp) ***
result : 0.025132217999999998[ms]
.
finish!

環境Ｂ

preparing ...
let's go!
.
*** simple (taint global scope) ***
result : 0.01606756[ms]
.
*** anonymous function ***
result : 0.01696756[ms]
.
*** closure (function only) ***
result : 0.01806756[ms]
.
*** closure (function and regexp) ***
result : 0.02216756[ms]
.
finish!